The essentials of descriptive geometry . Fig. 42. elevation of the revolved position of N. To find this point re-volve BN parallel to G. L. at bn^. From n, drop a perpendicu-lar to intersect the arc; the point thus found is n, the elevation PROBLEMS ON THE LINE 47.

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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400462, bookyear1915